[MINC-development] experiments with EBTKS and N3

[Andrew Janke]

Hi Vlad,

Thanks for all this work, myself I hadn't seen this (being in general
a Ubuntu-phile). My preference would be to dump the FFT code in EBTKS
all together and use fftw! happen to know if this works or are the
results again different to EBTKS's version of FFT?

There is an example MINC usage of fftw in mincfft (still in
cvs/minc_dev/mincfft IIRC) if this helps.

In the meantime I see you are using the develop branch, any chance of
pushing the changes over to the master and tagging a release? From
there I can put a new .tar.gz up on packages.bic.mni.mcgill.ca/tgz
this is something that I think definitely warrants a new release.

Thanks


a


On 18 August 2012 04:05, Vladimir S. FONOV <vladimir.fonov at gmail.com> wrote:
> Hello Everybody,
>
> I've been trying to fix a bug in N3, causing it to crash on some
> files. It turned out that the results of sharpen_hist was not making
> sense when compiled on some platforms:  this behaviour would present
> itself was compiled on Debian 6, but wouldn't happen when compiled on
> Ubuntu 12.04.
>
> It turned out that the problem was caused by differences in
> implementation of FFT in EBTKS.  The underlying function Mat<T>._fft
> was implemented in Matrix.h for generic case , and then redefined in
> MatrixSpec.cc for cases of complex<double> and complex<float> . It
> turned out that generic implementation was incorrect, but specific
> implementation for complex<float> and complex<double> was correct.
> So, when due to some strange reasons linker would find specific
> implementation from MatrixSpec.cc ,  sharpen_hist would work as
> expected.
>
> Right now, I have made a lot of changes in EBTKS ( develop branch on
> https://github.com/BIC-MNI/EBTKS ).
>
> Right now N3 seem to work properly regardless how it is compiled, but
> the results on 32bit are not quite the same as on 64bit platform.
>
> --
> Best regards,
>
>  Vladimir S. Fonov ~ vladimir <dot> fonov <at> gmail <dot> com
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